Raw Value Enumerations

Swift Programming: The Big Nerd Ranch Guide (2nd E 14. Enumerations
1

How to understand this code?

> enum TextAlignment: Int{
>     case left = 1
>     case right = 2
>     case center = 20
> }
> TextAlignment.left.rawValue
> let myRawValue = 20
> if let myAlignment = TextAlignment(rawValue: myRawValue){
>     print("successfully converted \(myRawValue) into a TextAlignment")
> }else{
>     print("\(myRawValue) has no corresponding TextAlignment case")
> }

And yes we successfully converted 20 into TextAlignment but i dont understand why we need this?
What do we get useful with this code?

2

You would have to do that sort of thing if you were to recreate TextAlignment objects from archive data.

4

I agree with you in the case there is no need of optional binding

59